Publications de Volodymyr Savchenko

Detection of the Geminga pulsar at energies down to 20 GeV with the LST-1 of CTAO

Andrii Neronov, Oleg Kalashev, Volodymyr Savchenko

Context. Geminga is the third gamma-ray pulsar firmly detected by imaging atmospheric Cherenkov telescopes (IACTs) after the Crab and the Vela pulsars. Most of its emission is expected at tens of giga-electronvolts, and, out of the planned telescopes of th ...

2025

GRB 221009A: Observations with LST-1 of CTAO and Implications for Structured Jets in Long Gamma-Ray Bursts

Andrii Neronov, Oleg Kalashev, Volodymyr Savchenko

GRB 221009A is the brightest gamma-ray burst (GRB) observed to date. Extensive observations of its afterglow emission across the electromagnetic spectrum were performed, providing the first strong evidence of a jet with a nontrivial angular structure in a ...

2025

Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission

Andrii Neronov, Oleg Kalashev, Volodymyr Savchenko

Context. The recurrent nova RS Ophiuchi (RS Oph) underwent a thermonuclear eruption in August 2021. In this event, RS Oph was detected by the High Energy Stereoscopic System (H.E.S.S.), the Major Atmospheric Gamma Imaging Cherenkov (MAGIC), and the first L ...

2025

Performance of the MAGIC stellar intensity interferometer and expansion to MAGIC + CTAO-LST1 stellar intensity interferometer

Andrii Neronov, Oleg Kalashev, Volodymyr Savchenko

A new generation of optical intensity interferometers are emerging in recent years taking advantage of the existing infrastructure of Imaging Atmospheric Cherenkov Telescopes (IACTs). The MAGIC SII (Stellar Intensity Interferometer) in La Palma, Spain, has ...

SPIE2024

Results of the follow-up of ANTARES neutrino alerts

Volodymyr Savchenko

High-energy neutrinos could be produced in the interaction of charged cosmic rays with matter or radiation surrounding astrophysical sources. To look for transient sources associated with neutrino emission, a follow-up program of neutrino alerts has been o ...

IOP Publishing Ltd2024

A magnetar giant flare in the nearby starburst galaxy M82

Volodymyr Savchenko

Magnetar giant flares are rare explosive events releasing up to 1047 erg in gamma rays in less than 1 second from young neutron stars with magnetic fields up to 1015-16 G (refs. 1,2). Only three such flares have been seen from magnetars in our Galaxy3,4 an ...

NATURE PORTFOLIO2024

A detailed study of the very high-energy Crab pulsar emission with the LST-1

Andrii Neronov, Volodymyr Savchenko

Context. To date, three pulsars have been firmly detected by imaging atmospheric Cherenkov telescopes (IACTs). Two of them reached the TeV energy range, challenging models of very high-energy (VHE) emission in pulsars. More precise observations are needed ...

EDP SCIENCES S A2024

The Galaxy platform for accessible, reproducible, and collaborative data analyses: 2024 update

Volodymyr Savchenko

Galaxy (https://galaxyproject.org) is deployed globally, predominantly through free-to-use services, supporting user-driven research that broadens in scope each year. Users are attracted to public Galaxy services by platform stability, tool and reference d ...

OXFORD UNIV PRESS2024

INTEGRAL view of GRB 221009A

Volodymyr Savchenko

The gamma-ray burst GRB 221009A is among the most luminous of its kind and its proximity to Earth has made it an exceptionally rare observational event. The International Gamma-ray Astrophysics Laboratory (INTEGRAL) was in an optimal aspect position to use ...

Edp Sciences S A2024

A new method of reconstructing images of gamma-ray telescopes applied to the LST-1 of CTAO

Andrii Neronov, Oleg Kalashev, Volodymyr Savchenko

Context. Imaging atmospheric Cherenkov telescopes (IACTs) are used to observe very high-energy photons from the ground. Gamma rays are indirectly detected through the Cherenkov light emitted by the air showers they induce. The new generation of experiments ...

2024